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我目前正在開發一個項目,在這個項目中我必須並行運行多個耗時的MATLAB函數。爲了這個問題的目的,我們將該功能稱爲myfunc
。在MATLAB中使用parfor循環解決分段錯誤問題
myfunc
使用MEX文件並以每3小時一次的隨機分段違例結束。我無法診斷分段錯誤,因爲它來自我自己編寫的專有API。但是,我知道它發生在MEX文件中,而且我也知道它不是確定性地與我可以更改的任何設置相關。
我想解決分割違規問題,並且理想情況下我還想繼續在MATLAB中使用parfor函數。我的想法,現在是到PARFOR環路內使用嘗試捕捉循環如下:
%create an output cell to store nreps of output from 'myfunc'
output = cell(1,nreps)
%create a vector to keep track of how many runs finish successfully without the error
successfulrun = zeros(1,nreps);
% run myfunc in parallel
parfor i = 1:nreps
try
output{i}
successfulrun(i) = true
end
end
%rerun experiments that did not end up successfully
while sum(successulruns) < nreps
%count number of experiments to rerun and initialize variables to hold those results
reps_to_rerun = find(successfulruns == 0);
nreps_to_rerun = sum(reps_to_rerun);
newoutput = cell(1,nreps_to_rerun);
newsuccessfulrun = zeros(1,nreps_to_rerun)
%rerun experiments
parfor i = 1:nreps_to_rerun
try
newoutput{i};
newsuccessfulrun = true;
end
end
%transfer contents to larger loop
for i = 1:nreps_to_rerun
rerun_index = reps_to_rerun(i);
successfulrun(rerun_index) = newsuccessfulrun(i)
if newsuccessfulrun(i)
output{i} = newoutput{i};
end
end
end
我的問題是:
會不會是OK保持繼續運行多次重複這樣的連儘管MEX文件中存在分段違規問題?或者我應該清除內存/重新啓動matlabpool?我假設這應該不是問題,因爲分割侵犯是C.
有什麼辦法可以從parfor循環中「打破」嗎?
段錯誤要麼崩潰MATLAB,或停止代碼,並給你一個選擇,以嘗試繼續,您應該僅做TR ❖保存您的數據。你不會得到一個例外。除修復非法內存訪問外,沒有其他辦法可以解決這個問題。 – angainor 2012-09-05 07:43:01